BCAAS: A Blockchain-Based Certificateless Anonymous Aggregate Signcryption Scheme Using Edge Computing
Xingxing Chen, Qingfeng Cheng, Xiangyang Luo · IEEE Transactions on Vehicular Technology · 2025
With the advancement of intelligent transportation systems, advanced traffic information service systems have emerged as critical infrastructure that integrates multi-source data to offer real-time traffic condition services. Current systems mainly rely on cloud computing for centralized data storage and flexible resource scheduling. However, this architecture is vulnerable to service disruptions from single-point failures. The centrally stored sensitive data raises privacy breach risks, and massive terminal requests can cause computing and communication bottlenecks, hindering real-time response. To tackle these challenges, we propose a blockchain-based certificateless anonymous aggregate signcryption (BCAAS) scheme. It combines edge computing and distributed ledger technology to build a decentralized, trustworthy architecture. The scheme uses certificateless signcryption to safeguard vehicle identity anonymity and data transmission encryption. A lightweight aggregate verification algorithm is designed to boost edge node efficiency. The blockchain serves as a public key storage directory to prevent device public key replacement. Smart contracts enable malicious behavior tracing, ensuring privacy while precisely identifying malicious vehicles. Security analysis shows that BCAAS can effectively resist various potential security threats. Performance analysis and simulations on blockchain and vehicular networks indicate that BCAAS has better practical significance.